A field experiment was carried out in Anbar Governorate - Ramadi District to evaluate the effect of plant density stress and melatonin on the Fennel plant. A randomized complete plot design (R.C.B.D) was applied according to a split plot, with three replications and 9 m2 experimental units. The main plots included three plant densities (30, 40, 50 cm), while the secondary plots included the foliar application of three different concentrations of melatonin (0, 15, 30 mg. L−1). The results revealed a significant increment among all parameters, as the concentration of 15 mg L−1 recorded the highest value of plant’s height, secondary branches number, and dry weight. While the concentration of 30 mg L−1 recorded the highest activity of SOD, CAT, and POD enzymes, in comparison with the control treatment (0 mg L−1) which recorded the lowest values of all mentioned parameters. Also, the plant density of 40 cm recorded the highest enzymes activity, and the plant density of 30 cm gave the lowest activity for those enzymes.
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